Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 295, Issue 1-2, Pages 321-327Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2010.04.023
Keywords
FIB; Olivine; Ringwoodite; Shocked chondrite; TEM
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [18654091, 18104009, 19540500]
- Scientific Research of Priority Area [16075202]
- Grants-in-Aid for Scientific Research [22540488, 19540500, 18654091] Funding Source: KAKEN
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Pervasive replacement of original olivine grains by ringwoodite adjacent to a shock-melt vein of Yamato 791384 L6 chondrite was observed with a FEG-SEM. In these olivines, we observed three distinct olivine-ringwoodite textures arranged in a spatially successive arrangement from the wall of the shock-melt vein into the olivine grains: (1) polycrystalline ringwoodite, (2) oriented several sets of ringwoodite lamellae and (3) oriented single lamellae. TEM images show that the polycrystalline and oriented several sets of lamellae parts consist of polycrystalline ringwoodite, indicating that phase transformation from olivine to ringwoodite is controlled by incoherent growth mechanism. On the other hand, the set of oriented single lamellae consists of thin ringwoodite platelets (
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